﻿<html>
<head>
<title><hr/>标签的基本用法</title>
</head>
<body>
<p>天地环保简介</p>
<hr />
<p align="lefl">环保监测 </p>
<hr color="red"align="left"size="4"width="200"/>
<p align="center">环保治理 </p>
<hr color="#0000ff" align="ridht"   size="1" width="50%/>


